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Aquaporin

(Science: protein) plant cell wall polysaccharides containing predominantly arabinose and galactose.

two main types are recognised: arabinogalactan 1, found in the pectin portion of angiosperms and containing _(1-4) linked galactan and _ arabinose side chains, arabinogalactan II, a highly branched polymer containing _(1-3) and _ (1-6) linked galactose and peripheral _ arabinose residues. Arabinogalactan II is found in large amounts on some gymnosperms, especially larches and is related to AGP.